[libc++] [P1614] Implement std::compare_three_way_result.

Differential Revision: https://reviews.llvm.org/D103581

NOKEYCHECK=True
GitOrigin-RevId: 38812f4ac122df2cef7754d7afda8c9a08695a03
diff --git a/include/module.modulemap b/include/module.modulemap
index f9955a3..98ba8d3 100644
--- a/include/module.modulemap
+++ b/include/module.modulemap
@@ -361,6 +361,7 @@
 
     module __compare {
       module common_comparison_category { private header "__compare/common_comparison_category.h" }
+      module compare_three_way_result   { private header "__compare/compare_three_way_result.h"   }
       module ordering                   { private header "__compare/ordering.h"                   }
     }
   }